GNU bug report logs - #20241
25.0.50; `setq' with only one argument

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#20241: closed (25.0.50; `setq' with only one argument)
Date: Mon, 23 Nov 2015 14:32:06 +0000

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Your message dated 23 Nov 2015 14:31:12 -0000
with message-id <20151123143112.83911.qmail <at> mail.muc.de>
and subject line Re: bug#20241: 25.0.50; `setq' with only one argument
has caused the debbugs.gnu.org bug report #20241,
regarding 25.0.50; `setq' with only one argument
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Drew Adams <drew.adams <at> oracle.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; `setq' with only one argument
Date: Wed, 1 Apr 2015 07:53:36 -0700 (PDT)

See for example: `(setq mark-active)' in `compilation-goto-locus'
(compile.el).

setq' should not be called with only one argument.  It "works", with the
effect of assigning a value of nil, but it is poor form.  Typically this
is a sign of a typo.

Beyond this particular occurrence, I think that a wrong-number-of-args
error should be raised when `setq' is called with an odd number of
arguments.  That certainly corresponds to the syntax that is documented.
And it corresponds to the doc explanations that using `setq' is the same
as using `set' and quoting the variable.  And it corresponds to the
definition and behavior of `setq' in Common Lisp.



In GNU Emacs 25.0.50.1 (i686-pc-mingw32)
 of 2014-10-20 on LEG570
Bzr revision: 118168 rgm <at> gnu.org-20141020195941-icp42t8ttcnud09g
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking=yes,glyphs CPPFLAGS=-DGLYPH_DEBUG=1'

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From: Alan Mackenzie <acm <at> muc.de>
To: 20241-done <at> debbugs.gnu.org
Cc: Drew Adams <drew.adams <at> oracle.com>
Subject: Re: bug#20241: 25.0.50; `setq' with only one argument
Date: 23 Nov 2015 14:31:12 -0000

In article <mailman.3138.1427900048.31049.bug-gnu-emacs <at> gnu.org> you wrote:
> See for example: `(setq mark-active)' in `compilation-goto-locus'
> (compile.el).

> setq' should not be called with only one argument.  It "works", with the
> effect of assigning a value of nil, but it is poor form.  Typically this
> is a sign of a typo.

Fixed in emacs-25.  The interpreter now signals a wrong-number-of-args
error, and the byte compiler issues a warning.

-- 
Alan Mackenzie (Nuremberg, Germany).

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